I can’t seem to track down what is causing this. It happens with some models and not others. I am saving to a network drive, which may be part of it. As far as I can tell there are no other programs causing this issue. This was happening before and after the recent update (17.2.2555). I searched around in the forum, but didn’t see any other posts that matched this issue (others are during open/file selection, not during save).
I am using SketchUp Pro 2017 on a Windows 7 Professional:
Windows 7 Professional (64-bit)
XPS 8900, Intel Core i7-6700, 3.40 Ghz
8.00 GB Ram
NVIDIA Quadro M4000 graphics card